[Infant feeding in respiratory and gastrointestinal infections during the first six months of life].
OBJECTIVE To investigate the effect of the method of feeding on respiratory and gastrointestinal illnesses during the first six months of life. METHODS Observational study of infants feeding practice and respiratory and gastrointestinal illnesses in first six months who were born in Gynecology-Obstetric department in period from May-September 2004, who weighed 2500 gm or more and at least 37 gestation weeks. In that period was born 1838 babies. Dates were collected by means of answered questionnaires. RESULTS We sent 612 questionnaires and 518 (85%) were answered. From 493 eligible questionnaires 395 (80.1%) infants were breastfed, and 98 (20%) formula fed. A total of 279 episodes of illnesses were observed in 493 infants. These infants had on average 1.76 episodes of illnesses. The crude incidence density ratio (IDR) revealed a protective effect of breastfeeding on respiratory illnesses (IDR = 059; 95% confidence interval (CI), 0.44-0.79), for gastrointestinal illnesses (IDR = 0.50; CI, 0.24-0.86) and on all illnesses (IDR = 0.58; CI 0.45-0.86). The IDR adjusted in turn for infant's age, mother's age, socioeconomic status and cigarette consumption in family were similar to the crude IDR. CONCLUSION the results of this study suggest a protective effect of breastfeeding against respiratory and gastrointestinal illnesses.